Process of making metal chains of entangled solder-wire links.



ALBERT IBZ LZNER, OF BIRKENFELD, GERMANY.

PROCESS OF MAKING METAL CHAINS OE ENTANGLED SOLDIER-WIRE LINKS.

No Drawing.

Specification of Letters Patent.

Patented Dec. 24, 1912.

Application filed May 16, 1912. Serial No. 697,816.

To all whom it may concern:

Be it known that I, ALBERT Blizivnn, a subject of the German Emperor, andresldent of Birkenfeld, Germany, have invented certain new and useful Improvements in Processes of Making Metal Chains of Entangled Solder-Wire Links, of which thefollowing is a specification.

In order to state a partial review of the prior art, hitherto known processes of making metal chains, which have the object to effect a clean, durable soldering of single 7 links, consist in that the chains are first perfectly finished, hung into each other, and then coated with a deoxid'ation agent, which fills thecutt'ing joints. The dry crust produced is then removed fromthe outer'surfaces by rubbing or brushing, and the chain is first put into a binding liquid and then into a pulverized protecting medium, which prevents the solder from flowing over the outer surfaces. Said latter process step is effected by to and fro shaking of the chains in the mass consisting of graphite or the like, it being unavoidable toprevent the fine dust from entering part of the joints if these lie somewhat farther apart from each other than necessary and the deoxidation agent, after drying, does not fill them out entirely.

- Consequently, such joints cannot be soldered over their whole cut surfaces and the soldering point is thus liable to break. The whole process makes it also conditional that the vertical joints be entirely covered by the protect-ing medium, so that the flowing of the solder cannot be observed, which is very important for carrying out the soldering process. Any occurring faults can, therefore, not be remedied by suitable steps during the process.

The improved process hereinafter described and forming the subject matter of the present invention, has the advantage over said known processes that, while allowing anentirely clean soldering, it offers further every security of perfectly filling out the vertical joints and excluding any faults, particularly for the reason that the joints remain uncovered until the process is finished.

The improved process is carried out as r follows First, the solder cored wire is wound up to form spirals, which are then put into a solution of hepar anddvater until the metal is entirely coated with a sdlfid layer, which makes the outer surfaces of,

the wire solderproof. In order to prevent particles of said sulfid layer from getting into the joints in the further course of the process, the solder wire spirals thus pre- 30 pared are coated with a quickly drying varnish (for instance Zaponlack), which protects the solderproof cover against any attack by friction and the like.- Thereupon,

the spirals, which are wound upon a pin or as the like, are sawed transversely to the winding into single r-ing links or out after each other, said links being then hung into each other or entangled by hand or by any of the known mechanical contrivances, to form, the m chain. Finally, the chain thus formed is led through a soldering oven or soldered in any other way. The sulfid layer disappears by the soldering heat, in decomposing into its ingredlents, the sulfur burns and the metal is left in its original condition. This reaction follows from the fact that, if for instance thin layers of silver-sulfid (A S) are heated in the air, the'same is oxidized to sulfate of silver (Ag SOQ, which at a still 8%) higher temperature is decomposed into 'argent-ic oxid (Ag,()) and sulfuric anhydrid (S0 vArgentic oxid, when heated above 300 -centigrade-.-decomposes into metal and oxygen. As the soldering temperature ale ways exceeds said limit, and the sulfuric)- anhydrid is vaporized, finally always the silver alone will be left.

The main advantage of the improvedprocess lies in the fact that the cutting of the wire spirals is effected but immediately before the soldering, whereby the cut surfaces of the joints remain absolutelyclean and the joints remain visible up to the last moment, so that the flowing of the solder can be exactly observed and consequently the soldering process regulated.

1. A process of making metal chains ofentangled solder cored wire links, consisting 109 in winding solder cored wire into spirals, putting said spirals into a solderproofing" solution, providing them thereby with a solderproof cover, coating themwith aquickly drying varnish, then cutting them into single links, "hanging "said links into each other to form a chain, and finally soldering said chain, for the purpose set forth.

2. A process of making metal chains of: entangled solder cored wire links, consisting 5 in winding solder cored wire into spirals,

coating said spirals first with a sulfid layer and then with a quickly drying Varnish In testimony whereof I have hereunto set layer, then cuttlng them mto slngle hnks, my hand 1n the presence of two subscrlblng hanglng sald hnks Into each other to form a witnesses.

chain, and. finally soldering said chain, de- ALBERT BAZNER. {j stroying therebythe sulfid layer and leaving Witnesses:

the metal in its original condition, for the CARL ALT,

purpose set forth. MAX ALT. 

